Gemstone



FIG. 1 is an upper perspective view of a gemstone showing the new design;

FIG. 2 is a lower perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a first side elevational view thereof;

FIG. 5 is a second side elevational view thereof; and,

FIG. 6 is a bottom plan view thereof. 

CLAIM The ornamental design for a gemstone, as shown and described. 